Polyphase-current starter.



E. BESA'G.

POLYPHASE cumgzm STARTER;

APPLICATION FILED SEPT- I5. 1913- jj Patented July 20, 1915.

2 SHEETS-SHEET I.

PILOT 5- BESAG.

POLYPHASE CURRENT STARTER.

APPLICATION FILED SEPT- 15. 191;.

2'- SHEETS-SHEET 2-- UNITED STATES PATENT OFFICE.

ERNST IBESAG, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR TO THE FIRM OFI VOIGT 8t HAEFFNER ACTIEN GESELLSCHAFT, OF FRANKFORT-ON-THE-MAIN, GER-Many.

POLYPHASE-CURREN'T STARTER.

Patented July 20, 1915.

Application filed September 15, 1913. Serial No. 789,909.

To all whom it may concern:

Be it known that I, ERNST BESAG, a subject of'the German Emperor, and aresident of Frankfort-on-the-Main, Germany, have invented certain newand useful Improvements in Polyphase-Current Starters, of

speed.

which the following is a specification.

In automatic polyphase current starters in which a motor always rotatingin the same direction efi'ects the closing of the stator switch androtation of the rotor starter, the return of the rotor starter from theend to the initial position ofl'ers great difliculties. The arrangementbecomes still more complicated, if it is desired to obtain aninstantaneous closing of the stator circuit.

The present invention provides simple means for overcoming thisdifiiculty. The disconnecting of the stator is then effectedelectrically by releasing a pawl mechanism between the stator switchproper and its driving lever. The motor, for initiating the closingmovement of the stator switch drives a lever by means of a cam, untilthe lever comes into engagement with the stator switch, and at the sametime tensions a spring for the stator switch. This time is however alsoutilized for advancing the rotor starter in the same direction ofrotation as in starting, so that its contact brushes move from the endposition into the initial position next thereto. At the moment ofclosing the stator switch, the contact lever of the rotor starter istherefore in the correct position for starting. The further movement ofthe starting motor brings the contact brushes of the rotor starter intothe end position for normal running of the motor to be started, when thestarting motor is disconnected by any' well known arrangement.

Figure 1 is a diagrammatic view showing the parts in the positionsoccupied when the stator switch is opened; Fig. 2 is a similar viewshowing the parts in the positions assumed just prior to the statorswitch being closed; Fig. 3 illustrates the relation of the severalparts at the instant the stator switch is closed; Fig. 4-.=-shows thepositions when the motor has attained its normal The invention -.isfurther described and exemplified by a construction illustrated in a isthe auxiliary motor which, by means of the ear I) and the cams 0 acts onthe driving ever (i of the stator switch, and by means of thetransmission gear 6, on the contact lever f of the rotor starter. Thedriving lever d loosely movable on the spindle of the stator switch, canbe coupled to the stator switch 9 b means of a pawl 71. which is drawnout o engagement with the lever d by the armature i of a coil k. Whenthe pawl is disengaged, the spring Z returns the stator switch to thedisconnected position. The spring m is used for closing the statorswitch. The starting position of the rotor starter is shown in Figs. 2and 3, and the end position in Figs. 1 and 4.

Fig. 1 shows the arrangement after disconnection. The pawl connectionbetween the driving lever d and the stator switch 9, is broken, and thecontact lever f of the rotor'starter is in the end position. When theauxiliary motor a is operated, it drives the lever d by means of one ofthe cams 0, until the lever comes into engagement with the stator switch9 through the action of the pawl h. In this way the closing spring onfor the stator switch is tensioned. During the time required for themovement in question the contact lever f of the rotor starter is howevermoved by the action of the transmission gear e'from the position shownin Fig. 1 to the starting position shown in Figs. 2 and 3.

Fig. 2 shows the position of the parts immediately before the cam 0slides off from the lever d. An instant later, this sliding oil takesplace, and the previously tensioned spring m pulls the lever 01 and thestator switch 9 connected to the latter by the pawl, into the closingposition of the stator switch, shown in Fig. 3. The stator switch isthen in its closed position,'and the rotor starter in the position forstarting. Owing to continued rotation of the auxiliary motor a, thelever of the rotor starter is carried over the contacts, until theposition shown in Fig. 4. is reached, and the motor to be started hasreached its normal number of.

'motor, the coil is is supplied with current,

which attracts its armature i, so that the latter forces the pawl it outof engagement with the lever 03, and the spring Z brings the statorswitch into the open position (see Fig. 1).

The coil 70 can-be made as a tension coil,.

as a maximum relay and, with a slight modification, as a minimum relay,etc., without exceeding the scope of the invention.

What I claim as my invention is:

1. In an automatic polyphase current motor starting mechanism, thecombination of a stator switch, a rotor starter, a motor adapted to turnin one direction only, gearing connecting the motor and rotor starter, aspring for closing the stator switch, and means whereby when the rotorstarter is being turned to starting position said spring will be placedunder tension and released to automatically close the stator switch asthe rotor starter reaches starting position.

2. In an automatic polyphase current n1o tor starting mechanism, thecombination of a stator switch, a rotor starter, a motor adapted to turnin one direction only, gearing connecting the motor and rotor starter, alever movable about the axis of the stator switch, means for connectingsaid lever and stator, switch by movement of the lever in one direction,a spring for closing the stator switch adapted to be placed undertension by said movement of the lever, and means turning with the rotorstarter adapted to engage the lever and rock the same to engage thestator switch while the rotor starter is moving to starting position,said lever being released and the stator switch closed as the rotorstarter reaches such starting position.

3. In an automatic polyphase current motor starting mechanism, thecombination of a stator switch, a spring for closing said switch, arotor starter, a motor, and means actuated by the motor for'placing thespring of the stator switch under tension and simultaneously adjustingthe rotor starter to starting position.

4:- In an automatic polyphase current motor starting mechanism, thecombination of a stator switch, a lever adapted to be connected withsaid switch to actuate it, a spring for closing the stator switch, arotor starter, a motor, means driven by the motor adapted tointermittently engage said lever to place the stator switch closingspring under tension, and means'driven by the motor for turning therotor starter from its end to its starting position while said lever isconnected with the motor.

5. In an automatic polyphase current motor starting mechanism, thecombination of a stator switch, springs adapted to open and close saidswitch, a lever, means for engaging the lever and stator switch, a rotorstarter, a motor, gearing connecting the motor and rotor starter, andmeans geared to the motor and adapted to intermittently engage thelever, whereby said lever will be engaged with the stator switch and thespring for closing said switch placed under tension while the rotorstarter is being turned to starting position, the lever being releasedand the stator switch closed as the rotor starter arrives at startingposition.

In testimony whereof I affix my signature in presence of two witnesses.

ERNST BESAG.

Witnesses:

ERWIN Divnsnn, Lorre DICHL.

